make 'lock' usable in a mixed C/C++ world

[Bruno Haible]

The mingw port of GNU gettext now needs this.

2006-10-18  Bruno Haible  <address@hidden>

        * lock.h [C++]: Wrap definitions in extern "C".

*** gnulib-20061012/lib/lock.h  2006-08-15 13:35:30.000000000 +0200
--- gnulib-20061012-modified/lib/lock.h 2006-10-19 04:41:44.000000000 +0200
***************
*** 1,5 ****
  /* Locking in multithreaded situations.
!    Copyright (C) 2005 Free Software Foundation, Inc.
  
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
--- 1,5 ----
  /* Locking in multithreaded situations.
!    Copyright (C) 2005-2006 Free Software Foundation, Inc.
  
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
***************
*** 70,75 ****
--- 70,79 ----
  # include <pthread.h>
  # include <stdlib.h>
  
+ # ifdef __cplusplus
+ extern "C" {
+ # endif
+ 
  # if PTHREAD_IN_USE_DETECTION_HARD
  
  /* The pthread_in_use() detection needs to be done at runtime.  */
***************
*** 355,360 ****
--- 359,368 ----
      while (0)
  extern int glthread_once_singlethreaded (pthread_once_t *once_control);
  
+ # ifdef __cplusplus
+ }
+ # endif
+ 
  #endif
  
  /* ========================================================================= 
*/
***************
*** 366,371 ****
--- 374,383 ----
  # include <pth.h>
  # include <stdlib.h>
  
+ # ifdef __cplusplus
+ extern "C" {
+ # endif
+ 
  # if USE_PTH_THREADS_WEAK
  
  /* Use weak references to the GNU Pth threads library.  */
***************
*** 468,473 ****
--- 480,489 ----
  extern void glthread_once_call (void *arg);
  extern int glthread_once_singlethreaded (pth_once_t *once_control);
  
+ # ifdef __cplusplus
+ }
+ # endif
+ 
  #endif
  
  /* ========================================================================= 
*/
***************
*** 480,485 ****
--- 496,505 ----
  # include <synch.h>
  # include <stdlib.h>
  
+ # ifdef __cplusplus
+ extern "C" {
+ # endif
+ 
  # if USE_SOLARIS_THREADS_WEAK
  
  /* Use weak references to the old Solaris threads library.  */
***************
*** 600,605 ****
--- 620,629 ----
  extern void glthread_once (gl_once_t *once_control, void (*initfunction) 
(void));
  extern int glthread_once_singlethreaded (gl_once_t *once_control);
  
+ # ifdef __cplusplus
+ }
+ # endif
+ 
  #endif
  
  /* ========================================================================= 
*/
***************
*** 608,613 ****
--- 632,641 ----
  
  # include <windows.h>
  
+ # ifdef __cplusplus
+ extern "C" {
+ # endif
+ 
  /* We can use CRITICAL_SECTION directly, rather than the Win32 Event, Mutex,
     Semaphore types, because
       - we need only to synchronize inside a single process (address space),
***************
*** 741,746 ****
--- 769,778 ----
      glthread_once (&NAME, INITFUNCTION)
  extern void glthread_once (gl_once_t *once_control, void (*initfunction) 
(void));
  
+ # ifdef __cplusplus
+ }
+ # endif
+ 
  #endif
  
  /* ========================================================================= 
*/